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127 lines
3.9 KiB
Python
127 lines
3.9 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2018 Mike Fährmann
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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"""OAuth helper functions and classes"""
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import hmac
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import time
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import base64
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import random
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import string
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import hashlib
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import urllib.parse
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import requests
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import requests.auth
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from . import text
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def nonce(size, alphabet=string.ascii_letters):
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"""Generate a nonce value with 'size' characters"""
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return "".join(random.choice(alphabet) for _ in range(size))
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def quote(value, quote=urllib.parse.quote):
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"""Quote 'value' according to the OAuth1.0 standard"""
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return quote(value, "~")
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def concat(*args):
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"""Concatenate 'args' as expected by OAuth1.0"""
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return "&".join(quote(item) for item in args)
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class OAuth1Session(requests.Session):
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"""Extension to requests.Session to support OAuth 1.0"""
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def __init__(self, consumer_key, consumer_secret,
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token=None, token_secret=None):
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requests.Session.__init__(self)
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self.auth = OAuth1Client(
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consumer_key, consumer_secret,
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token, token_secret,
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)
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def rebuild_auth(self, prepared_request, response):
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if "Authorization" in prepared_request.headers:
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del prepared_request.headers["Authorization"]
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prepared_request.prepare_auth(self.auth)
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class OAuth1Client(requests.auth.AuthBase):
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"""OAuth1.0a authentication"""
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def __init__(self, consumer_key, consumer_secret,
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token=None, token_secret=None):
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self.consumer_key = consumer_key
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self.consumer_secret = consumer_secret
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self.token = token
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self.token_secret = token_secret
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def __call__(self, request):
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oauth_params = [
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("oauth_consumer_key", self.consumer_key),
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("oauth_nonce", nonce(16)),
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("oauth_signature_method", "HMAC-SHA1"),
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("oauth_timestamp", str(int(time.time()))),
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("oauth_version", "1.0"),
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]
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if self.token:
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oauth_params.append(("oauth_token", self.token))
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signature = self.generate_signature(request, oauth_params)
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oauth_params.append(("oauth_signature", signature))
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request.headers["Authorization"] = "OAuth " + ",".join(
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key + '="' + value + '"' for key, value in oauth_params)
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return request
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def generate_signature(self, request, params):
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"""Generate 'oauth_signature' value"""
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url, _, query = request.url.partition("?")
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params = params.copy()
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for key, value in text.parse_query(query).items():
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params.append((quote(key), quote(value)))
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params.sort()
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query = "&".join("=".join(item) for item in params)
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message = concat(request.method, url, query).encode()
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key = concat(self.consumer_secret, self.token_secret or "").encode()
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signature = hmac.new(key, message, hashlib.sha1).digest()
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return quote(base64.b64encode(signature).decode())
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class OAuth1API():
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"""Base class for OAuth1.0 based API interfaces"""
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API_KEY = None
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API_SECRET = None
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def __init__(self, extractor):
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self.log = extractor.log
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api_key = extractor.config("api-key", self.API_KEY)
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api_secret = extractor.config("api-secret", self.API_SECRET)
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token = extractor.config("access-token")
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token_secret = extractor.config("access-token-secret")
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if api_key and api_secret and token and token_secret:
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self.log.debug("Using OAuth1.0 authentication")
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self.session = OAuth1Session(
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api_key, api_secret, token, token_secret)
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self.api_key = None
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else:
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self.log.debug("Using api_key authentication")
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self.session = extractor.session
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self.api_key = api_key
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